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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Jun. 30, 2021
Jun. 30, 2020
Sep. 30, 2020
Income Taxes, Additional Information [Line Items]                
Effective income tax rate 14.00%   1.00%     21.00% 20.00%  
Ireland statutory income tax rate           12.50% 12.50%  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount $ 105              
Gross tax effected unrecognized tax benefits               $ 2,528
Amount of unrecognized tax benefits which may impact effective tax rate               2,132
Total net accrued interest, net of tax benefit               205
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense           $ 37 $ 55  
Unrecognized Tax Benefit Decrease Resulting From Tax Audit Resolution     $ 22 $ 22        
Mark-to-market gain (loss) 66 $ 209 (132)          
Mark-to-market gain (loss), tax 17 53 (34)          
Restructuring and impairment costs 79   610 62   175 $ 783  
Restructuring charges, tax 15 15 28 $ 4 $ 16      
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount         30      
2020 Restructuring Plan                
Income Taxes, Additional Information [Line Items]                
Restructuring and impairment costs     $ 610   $ 111     $ 297
2021 Restructuring Plan                
Income Taxes, Additional Information [Line Items]                
Restructuring and impairment costs $ 79 $ 96       $ 175